This excerpt taken from the PCG 10-K filed Feb 24, 2009.
SRSP Small Company Stock Index Fund seeks to match the performance of the Russell Small Cap Completeness Index. The Fund invests in all of the stocks in the Russell Special Small Cap Completeness Index in proportion to their weightings in the Index. These stocks represent about 15% of the market value of all publicly traded common stocks in the United States. The strategy of investing in the same stocks as the Russell Small Cap Completeness Index minimizes the need for trading and results in lower expenses. The Fund is managed by State Street Global Advisors (SSgA).